What is My User Agent?
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What is User Agent (UA)
When you use your browser to load a webpage, your browser sends a number of headers to the server of the website that you're visiting. The headers helps the browser and the web server to determine the best way to work together in-order to provide the information from the site. One of the headers is the User Agent header which helps the server identify the type of browser (some features are not supported well on some browsers so when the server know which browser is requesting the information it can compensate some of the incompatibilities.
Internet Explorer (IE9) User Agent string
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
Mozilla/5.0 - Application name and version.
compatible - Compatibility flag token
MSIE 9.0 - Internet Explorer 9
Windows NT 6.1 - The Platform token identifies the operating system and version
Trident/5.0 - The Trident token identifies the version of MSHTML
FireFox User Agent
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:18.0) Gecko/20100101 Firefox/18.0
Mozilla/5.0- Application name and version.
Platform - describes the native platform the browser is running on (e.g. Windows, Mac, Linux or Android), and whether or not it's a mobile phone.
rv:geckoversion - indicates the release version of Gecko (such as "17.0").
Gecko/geckotrail - indicates that the browser is based on Gecko (Desktop, geckotrail is the fixed string "20100101"
Firefox/firefoxversion indicates the browser is Firefox, and provides the version (such as "17.0").
Examples of User Agent Strings
Internet Explorer (IE) - Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; )
Firefox - Mozilla/5.0 (Windows; U; Windows NT 5.2; en-GB; rv:220.127.116.11) Gecko/20081029 Firefox/18.104.22.168
Opera - Opera/9.80 (Windows NT 5.1; U; cs) Presto/2.2.15 Version/10.00
Safari - Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_5; en-us) AppleWebKit/525.26.2 (KHTML, like Gecko) Version/3.2 Safari/525.26.12
iPhone - Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25
ipad - Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25